Home / 20,378.50-28,123.77-11,306.83

Finding the Fourth Proportional to 20,378.50, 28,123.77 and 11,306.83

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Solution

The fourth proportional to 20,378.50, 28,123.77 and 11,306.83 is: 15,604.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,378.50 : 28,123.77 = 11,306.83 : x
  2. Step 2: Convert to fraction form
    20,378.50/28,123.77 = 11,306.83/x
  3. Step 3: Cross multiply
    20,378.50x = 28,123.77 × 11,306.83
  4. Step 4: Simplify right side
    20,378.50x = 317,990,721.50
  5. Step 5: Solve for x
    x = 317,990,721.50/20,378.50
  6. Step 6: Final answer
    x = 15,604.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.